Credit Facilities	6 Months Ended
Credit Facilities	Jul. 01, 2011
Financing Liability for Construction in Progress [Abstract]
CREDIT FACILITIES	NOTE 8: CREDIT FACILITIES Harmonic has a bank line of credit facility with Silicon Valley Bank, which provides for borrowings of up to $10.0 million that matures on September 2, 2011. As of July 1, 2011, other than standby letters of credit and guarantees (Note 15), there were no amounts outstanding under the line of credit facility and there were no borrowings in the six months ended July 1, 2011. This facility, which was amended and restated in March 2010, contains a financial covenant with the requirement for Harmonic to maintain unrestricted cash, cash equivalents and short-term investments, net of credit extensions, of not less than $35.0 million. If Harmonic were unable to maintain this cash, cash equivalents and short-term investments balance, Harmonic would not be in compliance with the facility. In the event of noncompliance by Harmonic with the covenants under the facility, Silicon Valley Bank would be entitled to exercise its remedies under the facility, including declaring all obligations immediately due and payable. At July 1, 2011, Harmonic was in compliance with the covenants under this line of credit facility. Future borrowings pursuant to the line would bear interest at the bank’s prime rate (4.0% at July 1, 2011). Borrowings are payable monthly and are not collateralized.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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